package com.netty4.decoder;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

public class EchoServer {
    public static void main(String[] args) {
        try {
            new EchoServer().bind(8080);
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    public void  bind(int port) throws  Exception{
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(boss,worker).option(ChannelOption.SO_BACKLOG,100).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes());
                            socketChannel.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,delimiter));
                            socketChannel.pipeline().addLast(new StringDecoder());
                            socketChannel.pipeline().addLast(new EchoServerHanler());
                        }
                    });
            ChannelFuture f = b.bind(port).sync();
            f.channel().closeFuture().sync();
        }finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }
}
